DOC: management: mention "show sess help" and "show quic help"

These ones were recently added but we forgot to update the doc.

doc/management.txt

@@ -3195,7 +3195,8 @@ show quic [<format>] [<filter>]
   values, "oneline" for the default format and "full" to display all
   information. Alternatively, a list of comma-delimited fields can be specified
   to restrict output. Currently supported values are "tp", "sock", "pktns",
-  "cc" and "mux".
+  "cc" and "mux". Finally, "help" in the format will instead show a more
+  detailed help message.
 
   The final argument is used to restrict or extend the connection list. By
   default, connections on closing or draining state are not displayed. Use the
@@ -3352,6 +3353,8 @@ show sess [<id> | older <age> | susp | all] [<options>*]
     - show-uri: Dump the transaction URI, as captured during the request
       analysis. It is only displayed if it was captured.
 
+    - help:     dump a more detailed help message instead
+
 show stat [domain <resolvers|proxy>] [{<iid>|<proxy>} <type> <sid>] \
           [typed|json] [desc] [up|no-maint]
   Dump statistics. The domain is used to select which statistics to print; dns